Hitachi EX1900-5 Operator's Manual page 183

Change Hydraulic Oil
--- every 4000 hours, 2500 hours
or 2000 hours
IMPORTANT: Hydraulic oil changing intervals differ
according to kind of hydraulic oils used.
(See Recommended Oil Chart in this
group)
CAUTION: Hydraulic oil may be hot. Wait for oil
to cool before starting work.
1. Park the machine on a level surface with the upper-
structure rotated 90° for easier access.
2. Position the machine with the arm cylinder fully re-
tracted and the bucket cylinder fully extended.
3. Lower the bucket to the ground as illustrated.
4. Turn the auto-idle switch off.
IMPORTANT: The turbocharger may be damaged if the
engine is not properly shut down.
5. Run the engine at slow idle speed without load for five
minutes.
6. Stop the engine. Remove the key from the key switch.
7. Pull the pilot control shut-off lever to the LOCK posi-
tion.
8. Clean the top of the hydraulic oil tank to keep dirt out
of the hydraulic system.
CAUTION: Keep body and face away from cap (1).
Turn cap (1) slowly and remove the cap only after
releasing the internal pressure completely.
9. Insert the wrench as shown and turn the wrench
clockwise and hold the wrench.
10. Turn cap (1) counterclockwise about 30°, at which
point stop cap (1) to release the air.
11. Turn cap (1) further and remove cap (1).
12. Align the projected part of cap (1) with the projected
part of the case and install cap (1).
13. Remove cover (4).
14. Drain oil using a suction pump.
The hydraulic oil tank capacity, up to specified oil level,
is approximately 2200 liters (580 US gal).
MAINTENANCE
7-51
Cap (1)
Arrow
Projection
Case Assembly
Projection
Side Hole
Wrench 4 mm
M142-07-092
M117-07-126
1
4
M18C-07-023
M110-07-022